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## org.bouncycastle.crypto.engines
Class XSalsa20Engine

    java.lang.Object
      org.bouncycastle.crypto.engines.Salsa20Engine
          org.bouncycastle.crypto.engines.XSalsa20Engine

All Implemented Interfaces:
  SkippingCipher, SkippingStreamCipher, StreamCipher

public class XSalsa20Engine
extends Salsa20Engine

Implementation of Daniel J. Bernstein's XSalsa20 stream cipher - Salsa20 with an extended nonce.

XSalsa20 requires a 256 bit key, and a 192 bit nonce.

Field Summary

Fields inherited from class org.bouncycastle.crypto.engines.Salsa20Engine
`DEFAULT_ROUNDS, engineState, rounds, sigma, tau, x`

Constructor Summary
`XSalsa20Engine()`

Method Summary
`java.lang.String` | `getAlgorithmName()` Return the name of the algorithm the cipher implements.
`protected int` | `getNonceSize()`
`protected void` | `setKey(byte[] keyBytes, byte[] ivBytes)` XSalsa20 key generation: process 256 bit input key and 128 bits of the input nonce using a core Salsa20 function without input addition to produce 256 bit working key and use that with the remaining 64 bits of nonce to initialize a standard Salsa20 engine state.

Methods inherited from class org.bouncycastle.crypto.engines.Salsa20Engine
`advanceCounter, advanceCounter, generateKeyStream, getCounter, getPosition, init, packTauOrSigma, processBytes, reset, resetCounter, retreatCounter, retreatCounter, returnByte, salsaCore, seekTo, skip`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### XSalsa20Engine

    public XSalsa20Engine()

Method Detail

### getAlgorithmName

    public java.lang.String getAlgorithmName()

  Description copied from interface: `StreamCipher`
  Return the name of the algorithm the cipher implements.

  Specified by:
    `getAlgorithmName` in interface `StreamCipher`
  Overrides:
    `getAlgorithmName` in class `Salsa20Engine`

### getNonceSize

    protected int getNonceSize()

  Overrides:
    `getNonceSize` in class `Salsa20Engine`

### setKey

    protected void setKey(byte[] keyBytes,
                          byte[] ivBytes)

  XSalsa20 key generation: process 256 bit input key and 128 bits of the input nonce using a core Salsa20 function without input addition to produce 256 bit working key and use that with the remaining 64 bits of nonce to initialize a standard Salsa20 engine state.

  Overrides:
    `setKey` in class `Salsa20Engine`

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